• Journal of Advanced Marine Engineering and Technology
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• 제35권6호
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• pp.861-866
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• 2011

본 논문에서는 파도의 상하운동에 의해 발전되는 형발전시스템과 진동발전시스템이 결합된 하이브리드 발전방법을 제안한다. 선형발전시스템은 권선과 영구자석으로 구성되어있고, 파도의 상하운동속도를 직접적으로 사용하므로 파도의 주파수에 관계없이 안정적인 발전을 한다. 그리고 진동발전시스템은 진동시스템인 영구자석, 스프링과 발전시스템인 영구자석, 권선으로 구성되어 있다. 진동발전시스템은 파도의 주파수와 진동시스템의 고유진동수를 일치시킨 공진대역에서 구동함으로써 파도의 상하운동 속도보다 더 큰 속도를 이용하여 더 많은 전기에너지를 얻을 수 있다. 따라서 본 연구에서 제안한 하이브리드 파력발전방법은 공진영역에서 더 많은 전기에너지를 얻을 수 있을 뿐만 아니라 공진영역을 벗어난 대역에서도 안정적으로 발전할 수 있는 장점을 가짐을 알 수 있다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제50권6호
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• pp.282-289
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• 2001

This paper introduces the scheme that improve the control performance of electromagnetic levitation system with zero power controller. Magnetic levitation is used widely, but the electromagnetic force has nonlinear characteristics because it is proportioned to a square of the magnetic flux density and it is in inverse proportion to a square of the airgap. So, it is complicate and difficult to control the electromagnetic force. Besides, it is more difficult to control if the equivalent gap is unknown in case of zero power control. Therefore, this paper proposed the hybrid electro-magnetic levitation control method in which the variable load is estimated by using a load observer and its system controlled at a new zero power equilibrium airgap position. Also it is confirmed that the proposed control method improve the control performance through simulation and experiment.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.1322-1324
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• 2001

FuelCell/Battery hybrid power systems were studied to develop high efficient zero-emission fuel cell electric vehicles. Fuel cells were used as an auxiliary energy source and batteries were used as a transient power source. The fuel cell system is used to supply the average power demand. Dynamic response of the hybrid systems was simulated using PSPICE program and also tested experimentally. The results can be used to design the interface module and to determine the power requirement between the fuel cell unit and the battery pack.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 추계학술대회 논문집
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• pp.147-148
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• 2012

Recently, hybrid generation systems combine multiple energy sources or storage components to optimize the characteristics of the individual energy sources. In this paper, a battery integrated PV power optimizer for PV-battery hybrid power generation system is proposed. PV system using proposed topology can easily increase battery capacity and remove high power bidirectional converter to control bulky battery bank.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.3081-3083
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• 2000

Fuel cell/battery hybrid power systems were studied to develop high efficient zero-emission fuel cell electric vehicles, Fuel cells were used as an auxiliary energy source and batteries were used as a transient power source. The fuel cell system is used to supply the average power demand. Dynamic response of the hybrid systems was simulated using PSPICE program and also tested experimentally, The results can be used to design the interface module and to determine the power requirement between the fuel cell unit and the battery pack.

• Journal of Electrical Engineering and Technology
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• 제9권2호
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• pp.399-405
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• 2014

For stable integration of large-scale wind farms, integration standards (Grid codes) have been proposed by the system operator. In particular, voltage control of large-scale wind farms is gradually becoming important because of the increasing size of individual wind farms. Among the various voltage control methods, Secondary Voltage Control (SVC) is a method that can control the reactive power reserve of a control area uniformly. This paper proposes hybrid SVC when a large-scale wind farm is integrated into the power grid. Using SVC, the burden of a wind turbine converter for generating reactive power can be reduced. To prove the effectiveness of the proposed strategy, a simulation study is carried out for the Jeju system. The proposed strategy can improve the voltage conditions and reactive power reserve with this hybrid SVC.

• Journal of Power Electronics
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• 제19권5호
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• pp.1099-1107
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• 2019

A soft switching converter with wide voltage range operation is investigated in this paper. A series resonant converter is implemented to achieve a high circuit efficiency with soft switching characteristics on power switches and rectifier diodes. To improve the weakness of the narrow voltage range in LLC converters, an alternating current (ac) power switch is used on the primary side to select a half-bridge or full-bridge resonant circuit to implement 4:1 voltage range operation. On the secondary-side, another ac power switch is adopted to select a full-wave rectifier or voltage-doubler rectifier to achiever an additional 2:1 output voltage range. Therefore, the proposed resonant converter has the capacity for 8:1 (320V~40V) wide output voltage operation. A single-stage hybrid resonant converter is employed in the study circuit instead of a two-stage dc converter to achiever wide voltage range operation. As a result, the study converter has better converter efficiency. The theoretical analysis and circuit characteristics are verified by experiments with a prototype circuit.

• 한국ITS학회 논문지
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• 제12권1호
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• pp.109-120
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• 2013

본 논문에서는 태양광 발전을 이용한 하이브리드 도로조명 제어 시스템 설계를 제안한다. 제안하는 하이브리드 도로조명 점등제어 시스템은 태양광 발전을 이용하여 하이브리드 컨트롤러를 통해 전원을 공급하고 도로조명을 점등제어가 가능하도록 설계한다. 전력 부족시 상시전력을 공급하도록 제어하고 인체 감지시 자동 조명 제어가 되도록 게이트웨이는 도로조명에 zigbee를 이용하여 제어명령을 전송한다. 미리 설정해 놓은 타임 스케줄에 의해 시스템의 상태를 결정하고 동작시키는 점등제어 알고리즘을 적용한다. 본 논문에서 제안하는 하이브리드 도로조명 점등제어 시스템의 효율성 분석결과, 등주 당 하루에 129.6W의 전력소비를 하였고 1개월간 3.8KW, 연간 47.3KW를 소비하였다. 결과적으로 기존의 점등제어 시스템보다 76.2%의 전력소비량 감소와 76.8%의 전력요금이 감소되어 에너지 효율을 높일 수 있었다.

• 한국태양에너지학회 논문집
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• 제29권4호
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• pp.41-47
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• 2009

Wind/diesel hybrid operation can be one of the most effective option for electrical power production at a remote area such as Antarctica. The king Sejong station at Antarctica relies its power production on diesel engines and diesel oil is supplied every other year by ships. However, the oil transportation processes are liable to potential oil spillage caused by the floating ice around the King George island. The long-term storage of the oil at the station can also contaminate the surrounding soils. A l0kW wind turbine has been installed to save oil consumption and operated in connection with the diesel generators since 2006. The diesel engine that operated poorly during the first year of installation was replaced in 2008 to enhance power production an recent measurements indicate that both diesel power quality and the wind turbine availability have been dramatically improved by the replacement. This report discusses electrical power qualities of wind/diesel hybrid system operating at an isolated micro gird located in the king Sejong station. Our experience reveals that the similar technologies can be applied to domestic islands, for example, in the south sea.

• ETRI Journal
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• 제34권6호
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• pp.838-846
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• 2012

This paper proposes a cost-effective hybrid-type power budget extender (PBEx) that can provide a high power budget of over 45 dB in an asymmetric 10-Gb/s Ethernet passive optical network (10/1G-EPON). The hybrid-type 10/1G-EPON PBEx comprises a central office terminal (COT) and remote terminal (RT) module supporting four channels and uses a coarse wavelength division multiplexing (CWDM) technology between the COT and RT for a reduction of fiber cost and efficient access network design. The proposed 10/1G-EPON PBEx can provide over a 40-km reach and 128-way split per CWDM wavelength with no modification of a legacy 10/1G-EPON system and can satisfy the error-free service in $10^{10}$ packet transmission.